package cn.com.yangzhenyu.brick.util;

import java.security.MessageDigest;
import java.util.Objects;

/**
 * Created with IntelliJ IDEA
 * Created By 杨振宇
 * Date: 2019/1/25
 * Time: 21:11
 */
public class TokenUtils {
    private static String KEY = "Yttrium";
    private static String PASSWORD_KEY = "Yttrium-App-";
    public static String token(int userId){
        String key = KEY + userId;
        return MD5(key);
    }
    public static boolean isAuto(int userId, String token) {
        return token.equals(token(userId));
    }
    public static String mmPassword(String password){
        String key = PASSWORD_KEY + password;
        return Objects.requireNonNull(MD5(key)).toLowerCase();
    }
    public static boolean appPasswordAuto(String password,String mm){
        return mm.equals(mmPassword(password));
    }

    /**
     * 对字符串md5加密(大写+数字)
     *
     * @param s 传入要加密的字符串
     * @return  MD5加密后的字符串
     */

    private static String MD5(String s) {
        char hexDigits[]={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};

        try {
            byte[] btInput = s.getBytes();
            // 获得MD5摘要算法的 MessageDigest 对象
            MessageDigest mdInst = MessageDigest.getInstance("MD5");
            // 使用指定的字节更新摘要
            mdInst.update(btInput);
            // 获得密文
            byte[] md = mdInst.digest();
            // 把密文转换成十六进制的字符串形式
            int j = md.length;
            char str[] = new char[j * 2];
            int k = 0;
            for (int i = 0; i < j; i++) {
                byte byte0 = md[i];
                str[k++] = hexDigits[byte0 >>> 4 & 0xf];
                str[k++] = hexDigits[byte0 & 0xf];
            }
            return new String(str);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    public static void main(String[] args) {
        System.out.println(token(3));
    }


}
